CN111474724A - Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment - Google Patents

Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment Download PDF

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CN111474724A
CN111474724A CN202010418635.9A CN202010418635A CN111474724A CN 111474724 A CN111474724 A CN 111474724A CN 202010418635 A CN202010418635 A CN 202010418635A CN 111474724 A CN111474724 A CN 111474724A
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light
wave
coupling
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李艳
崔海涛
钱进
雍海波
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Goolton Technology Co ltd
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Priority to CN202011006071.4A priority patent/CN111948824B/en
Priority to CN202110198095.2A priority patent/CN112711141B/en
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    • G02B27/01Head-up displays
    • G02B27/017Head mounted
    • G02B27/0172Head mounted characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
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    • G02B2027/0174Head mounted characterised by optical features holographic

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Abstract

The present disclosure relates to a holographic optical waveguide device and an augmented reality display apparatus for three-dimensional dynamic display, the holographic optical waveguide device including: the optical-mechanical system comprises a laser illumination system and a micro-display, wherein the micro-display is used for loading a three-dimensional calculation hologram obtained by performing wave-front coding on a three-dimensional scene, modulating light waves irradiated to the micro-display by the laser illumination system according to the three-dimensional calculation hologram, and enabling the modulated light waves carrying wave-front information distribution of the three-dimensional scene to enter a lens system; the lens system is used for filtering the light waves carrying the three-dimensional scene wave front information distribution and then injecting the light waves into the coupling-in multiplexing volume holographic grating; coupling multiplexing volume holographic grating, coupling light wave carrying three-dimensional scene wave front information distribution into waveguide plate; the waveguide plate transmits the light waves carrying three-dimensional scene wave-front information distribution to the coupling-out multiplexing volume holographic grating in a total reflection mode; and the coupling-out multiplexing volume holographic grating couples out the light waves carrying the wave front information distribution of the three-dimensional scene to human eyes.

Description

Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment
Technical Field
The present disclosure relates to the field of augmented reality technologies, and in particular, to a holographic optical waveguide device for three-dimensional dynamic display and an augmented reality display apparatus.
Background
Near-eye display is that when an observer watches an external real object, information such as images or data superposed in a real environment can be watched, and the near-eye display provides a real-time field interaction function which is not available in the traditional display equipment and has no barrier with the real environment, so that brand-new visual experience is brought to users, and the near-eye display is widely applied to various fields. The holographic waveguide combines the total reflection characteristic of the waveguide with the diffraction characteristic of the holographic grating, can realize large-view-field and large-exit-pupil image output, and is applied to a new generation helmet display system.
The computer holography is to generate the needed object model by computer graphics, sample the wave front, input the obtained object light wave field expression with discrete distribution into the computer and form digital hologram by a certain coding mode, then load the computer holography on the liquid crystal screen such as S L M, when there is a beam of reference light, it can reappear the clear reappearance image of the object model on the display screen with a certain distance.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a holographic optical waveguide device for three-dimensional dynamic display and an augmented reality display apparatus, which are used to implement a real-time dynamic display process for any three-dimensional object model.
According to a first aspect of embodiments of the present disclosure, there is provided a holographic optical waveguide device for three-dimensional dynamic display, comprising: the optical-mechanical system, the lens system, the coupling-in multiplexing volume holographic grating, the waveguide plate and the coupling-out multiplexing volume holographic grating;
the optical-mechanical system comprises a laser illumination system and a micro-display, wherein the micro-display is used for loading a three-dimensional calculation hologram obtained by performing wave-front coding on a three-dimensional scene, the light wave irradiated to the micro-display by the laser illumination system is modulated according to the three-dimensional calculation hologram, and the modulated light wave carrying three-dimensional scene wave-front information distribution enters the lens system;
the lens system is used for filtering the light wave which is modulated by the three-dimensional calculation hologram loaded by the micro display and carries three-dimensional scene wave front information distribution and then injecting the light wave into the coupling-in multiplexing volume holographic grating;
the coupling multiplexing volume holographic grating is used for coupling light waves carrying three-dimensional scene wave front information distribution into the waveguide plate;
the waveguide plate is used for transmitting the light waves carrying three-dimensional scene wave-front information distribution to the coupled-out multiplex volume holographic grating in a total reflection mode;
and the coupling-out multiplexing volume holographic grating is used for coupling out the light waves carrying the three-dimensional scene wave-front information distribution to human eyes.
In one embodiment, the microdisplay comprises a reflective silicon-based liquid crystal display.
In one embodiment, preferably the periods of the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating are the same and mirror symmetric.
In one embodiment, preferably, the laser illumination system includes: the device comprises a laser, an attenuation plate, a half-wave plate, an optical fiber coupler, a single-mode polarization maintaining optical fiber, an optical fiber collimator, an electric control rotating platform, a focusing lens and a polarization splitting prism;
the laser is used for emitting polarized light;
the attenuation plate and the half-wave plate are sequentially arranged along the propagation direction of the polarized light and are used for processing the polarized light emitted by the laser into linearly polarized light and adjusting the input energy of the laser;
the optical fiber coupler is used for coupling the linearly polarized light into the single-mode polarization-maintaining optical fiber;
the single-mode polarization maintaining optical fiber is fixed on the electric control rotary table through an optical fiber collimator, and the light wave emergent end is positioned on the central extension line of a rotary disc of the electric control rotary table, and the plane where the light wave emergent end is positioned is the focal plane of the focusing lens, so that the angle of emergent light waves is adjusted by adjusting the rotating angle of the electric control rotary table;
the polarization beam splitter prism is used for emitting the emergent light wave into the micro display and emitting the light wave emitted by the micro display into the lens system.
In an embodiment, preferably, the microdisplay loads the three-dimensional computation hologram at a preset time interval, and determines an angle of a light wave entering the microdisplay according to the three-dimensional computation hologram, so as to adjust a rotation angle of the electrically controlled rotary table and a time length of the rotation angle according to the angle by a servo control system of the electrically controlled rotary table, so that the light wave emitted by the microdisplay carries three-dimensional scene wavefront information distribution, and dynamic display can be realized.
In one embodiment, preferably, the lens system includes: a first lens, a diaphragm and a second lens;
the first lens is used for imaging the light wave which is transmitted by the micro display and carries three-dimensional scene wave front information distribution on a first plane;
the diaphragm is arranged on the back focal plane of the first lens, deviates from the imaging center and is used for filtering out light waves of other diffraction orders except the first-order diffraction light waves;
and the second lens is used for converging the filtered light waves and then enabling the converged light waves to enter the coupling-in multiplexing volume holographic grating.
In one embodiment, preferably, the distance between the second lens and the first plane satisfies the following condition:
Figure 259782DEST_PATH_IMAGE001
wherein,
Figure 449455DEST_PATH_IMAGE002
represents the secondThe distance of the lens from said first plane,
Figure 349278DEST_PATH_IMAGE003
representing the focal length of the second lens.
In one embodiment, preferably, the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating comprise angle multiplexed volume holographic gratings.
In one embodiment, preferably, the angle-multiplexed volume hologram grating keeps the positions of the object light and the reference light fixed when recording the interference fringes, obtains different angle channels by rotating the recording material, and multiplexes the recording interference fringes at each angle channel, wherein the initial position of the recording material is such that the optical axis of the volume hologram grating is located on the bisector of the angle of the object light and the reference light.
In one embodiment, preferably, the rotation angle of the recording material satisfies the following condition:
Figure 603804DEST_PATH_IMAGE004
wherein,
Figure 905472DEST_PATH_IMAGE005
indicates the angle of rotation of the recording material,
Figure 266047DEST_PATH_IMAGE006
indicating the total number of rasters that need to be multiplexed,
Figure 590849DEST_PATH_IMAGE007
representing a minimum multiplexing angular separation;
the minimum multiplexing angular spacing satisfies the following condition:
Figure 960650DEST_PATH_IMAGE008
Figure 851246DEST_PATH_IMAGE007
the minimum multiplexing angular separation is indicated,
Figure 835251DEST_PATH_IMAGE009
denotes a bragg angle, L is the thickness of the recording material, λ is the wavelength of the recording light, and θ is the angle between the object light and the reference light and the optical axis at the time of recording.
According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display device, including the three-dimensional dynamically-displayed holographic optical waveguide device according to any one of the above technical solutions.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in the embodiment of the invention, the characteristics of effectively shortening the longitudinal length and expanding the exit pupil by utilizing the holographic waveguide are combined with the advantages that the calculation of the holographic device by the reflective silicon-based liquid crystal display L COS is simple, and the light wave field can be controlled at will, so that the real-time dynamic display process of any three-dimensional object model is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram illustrating the structure of a three-dimensional dynamically displayed holographic optical waveguide device, according to an exemplary embodiment.
Fig. 2 is a schematic structural diagram of a light mechanism system and a lens system in a three-dimensional dynamic display holographic optical waveguide device according to an exemplary embodiment.
FIG. 3 is a schematic diagram illustrating the imaging principle of a lens system in a three-dimensional dynamically displayed holographic optical waveguide device according to an exemplary embodiment.
Fig. 4 and 5 are schematic diagrams illustrating a method for preparing a volume holographic grating based on an angle multiplexing technique according to an exemplary embodiment.
FIG. 6 is a schematic illustration of a dynamic display of a volume holographic grating, according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Fig. 1 is a schematic structural diagram illustrating a three-dimensional dynamically displayed holographic optical waveguide device according to an exemplary embodiment, and as shown in fig. 1, the holographic optical waveguide device includes: an optical machine system 11, a lens system 12, an incoupling multiplex volume holographic grating 13, a waveguide plate 14 and an outcoupling multiplex volume holographic grating 15;
the optical-mechanical system 11 includes a laser illumination system 111 and a microdisplay 112, where the microdisplay 112 is used to load a three-dimensional computed hologram obtained by performing wavefront coding on a three-dimensional scene, and according to the three-dimensional computed hologram, an optical wave irradiated to the microdisplay 112 by the laser illumination system 111 is modulated, and an object optical wave carrying three-dimensional scene wavefront information distribution after modulation enters the lens system 12;
the lens system 12 is configured to filter the light wave modulated by the three-dimensional computer generated hologram loaded by the microdisplay 112 and carrying three-dimensional scene wavefront information distribution, and then inject the light wave into the coupling-in multiplexing volume holographic grating 13;
the coupling-in multiplexing volume holographic grating 13 is used for coupling light waves carrying three-dimensional scene wave front information distribution into the waveguide plate 14;
the waveguide plate 14 is configured to transmit the light waves carrying the three-dimensional scene wavefront information distribution to the coupling-out multiplexing volume holographic grating 15 in a total reflection manner;
the coupling-out multiplexing volume holographic grating 15 is used for coupling out the light waves carrying the three-dimensional scene wavefront information distribution to human eyes.
In one embodiment, the microdisplay 112 comprises a reflective silicon-based liquid crystal display L COS.
In one embodiment, preferably the periods of the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating are the same and mirror symmetric.
In the embodiment, the characteristics of effectively shortening the longitudinal length and expanding the exit pupil by using the holographic waveguide are combined with the advantages that the calculation of the holographic device by the reflective silicon-based liquid crystal display L COS is simple, and the light wave field can be controlled at will, so that the real-time dynamic display process of any three-dimensional object model is realized.
As shown in fig. 2, in one embodiment, the laser illumination system 111 preferably includes: the device comprises a laser 21, an attenuator 22, a half-wave plate 23, a fiber coupler 24, a single-mode polarization-maintaining fiber 25, a fiber collimator 26, an electric control rotary table 27, a focusing lens 28 and a polarization splitting prism 29;
the laser 21 is used for emitting polarized light;
the attenuation plate 22 and the half-wave plate 23 are sequentially arranged along the propagation direction of the polarized light and are used for processing the polarized light emitted by the laser 21 into linearly polarized light and adjusting the input energy of the laser;
the optical fiber coupler 24 is used for coupling the linearly polarized light into the single-mode polarization-maintaining optical fiber 25;
the single-mode polarization maintaining fiber 25 is fixed on the electric control rotary table 27 through a fiber collimator 26, and the light wave exit end is located on the central extension line of the rotary disc of the electric control rotary table 27, and the plane where the light wave exit end is located is the focal plane of the focusing lens 28, so as to adjust the angle of the exiting light wave by adjusting the rotation angle of the electric control rotary table 27;
the polarization beam splitter prism 29 is configured to emit the outgoing light wave into the microdisplay 112, and emit the light wave emitted from the microdisplay 112 into the lens system 12.
In this embodiment, the polarized light emitted by the laser (laser) first passes through a circular tunable attenuator, and a half-wave attenuatorLinearly polarized light is formed after the wave plate HWP, the linearly polarized light is coupled into a single-mode polarization maintaining Optical Fiber (OF) through an optical fiber coupler (L FC), the other end OF the single-mode polarization maintaining optical fiber is fixed on an electric control rotary table (RS) through an optical Fiber Collimator (FC), the emergent end OF the optical fiber is adjusted to the central extension line OF a disc (D) on the electric control rotary table, the plane where the emergent end OF the optical fiber is located is just the focal plane OF a focusing lens (F L), when the emergent end OF the optical fiber slightly moves in the vertical/horizontal direction along the diameter OF the disc in the plane, the incident illuminating light is oblique plane light wave, and the polar angle OF the incident illuminating light is the polar angle OF the incident illuminating light
Figure 444087DEST_PATH_IMAGE010
Can be read out through the marked scale on the disc of the rotating device, and the azimuth angle of the incident illumination light
Figure 617579DEST_PATH_IMAGE011
The oblique plane light wave is irradiated onto a Polarization Beam Splitter (PBS) where the P-wave part of the laser light is transmitted through the plane of polarization and the S-wave part of the laser light is reflected by the plane of polarization onto an L COS panel, and L COS modulates the incident light wave according to the loaded computer hologram to have a three-dimensional scene wavefront information distribution.
In one embodiment, preferably, the lens system 12 includes: a first lens 31, a diaphragm 32, and a second lens 33;
the first lens 31 is configured to image a light wave which is emitted by the microdisplay and carries three-dimensional scene wavefront information distribution on a first plane;
the diaphragm 32 is arranged at the back focal plane of the first lens 31, and the diaphragm 32 is offset from the imaging center and used for filtering out light waves of other diffraction orders except the first-order diffracted light waves;
and the second lens 33 is configured to converge the filtered light wave and then enter the incoupling multiplexing volume holographic grating 13.
In this embodiment, as shown in fig. 3, L COS modulated reflected light waves pass through a polarization plane, and are imaged on a first plane (plane1) through a first lens (L ens1), a stop is disposed at a back focal plane of the first lens (L ens1), the stop is shifted from an imaging center, only positive first order diffracted light waves pass through the stop, and a zero-order bright spot and other diffraction order reconstructed images are filtered out, and then the filtered light is converged by a second lens (L ens2), and then the converged light is incident on a multiplexed volume hologram grating manufactured based on an angle multiplexing technique, and object light loaded with three-dimensional scene wavefront information distribution and diffracted by the incident end multiplexed volume hologram grating is coupled into a flat optical waveguide.
The introduction of the second lens (L ens2) in FIG. 3 is to adjust the imaging position and size of the reconstructed image according to the geometric imaging formula of the lens:
Figure 628261DEST_PATH_IMAGE012
wherein,
Figure 533900DEST_PATH_IMAGE013
is the focal length of the second lens (L ens2),
Figure 630032DEST_PATH_IMAGE014
the distance between the object and the ground is the object distance,
Figure 27122DEST_PATH_IMAGE015
is the image distance, is then behind the second lens (L ens2)
Figure 829993DEST_PATH_IMAGE015
By changing the position of the second lens (L ens2), a sharp reproduction of different magnifications can be obtained at different imaging positionsLike this. To obtain an enlarged real image, settings are made
Figure 968850DEST_PATH_IMAGE016
The magnification is then such that the image is reproduced at a first plane (plane1)
Figure 739229DEST_PATH_IMAGE017
The size of the holographic reproduction image can be conveniently adjusted.
In an embodiment, preferably, the microdisplay loads the three-dimensional computation hologram at a preset time interval, and determines an angle of a light wave entering the microdisplay according to the three-dimensional computation hologram, so as to adjust a rotation angle of the electrically controlled rotary table and a time length of the rotation angle according to the angle by a servo control system of the electrically controlled rotary table, so that the light wave emitted by the microdisplay carries three-dimensional scene wavefront information distribution, and dynamic display can be realized.
In this embodiment, when the disk (D) is rotated, the generated illumination light with different inclination angles is irradiated to L COS, and the L COS is controlled to load each frame of the computation hologram time interval, so that the human eye can obtain different three-dimensional scene wavefront reconstruction results at different angular channels.
In one embodiment, preferably, the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating comprise angle multiplexed volume holographic gratings.
In one embodiment, preferably, as shown in fig. 4, the angle-multiplexed volume hologram grating keeps the positions of the object light and the reference light fixed when recording the interference fringes, as shown in fig. 5, different angle channels are obtained by rotating the recording material, and the interference fringes are multiplexed and recorded at each angle channel, wherein the initial position of the recording material is such that the optical axis of the volume hologram grating is located on the bisector of the angle of the object light and the reference light.
In one embodiment, preferably, the rotation angle of the recording material satisfies the following condition:
Figure 988945DEST_PATH_IMAGE018
wherein,
Figure 974218DEST_PATH_IMAGE005
indicates the angle of rotation of the recording material,
Figure 221660DEST_PATH_IMAGE006
indicating the total number of rasters that need to be multiplexed,
Figure 292384DEST_PATH_IMAGE007
representing a minimum multiplexing angular separation;
the minimum multiplexing angular spacing satisfies the following condition:
Figure 345791DEST_PATH_IMAGE008
Figure 873986DEST_PATH_IMAGE007
the minimum multiplexing angular separation is indicated,
Figure 354646DEST_PATH_IMAGE009
denotes a bragg angle, L is the thickness of the recording material, λ is the wavelength of the recording light, and θ is the angle between the object light and the reference light and the optical axis at the time of recording.
After the recording is finished, when object light waves with different angles and loaded with three-dimensional scene wave front information distribution are irradiated to the multiplexing volume holographic grating, different three-dimensional scene wave front reconstruction results can be obtained at different angle channels, as shown in figure 6, the accurate control L COS loads each frame to calculate the time interval of the hologram and the rotating angle of the electric control rotating platform, and the temporary stopping is carried out at each rotating angle position, and the dynamic wave front reconstruction holographic display effect can be obtained due to the temporary effect of vision of human eyes.
According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display device, including the three-dimensional dynamically-displayed holographic optical waveguide device according to any one of the above technical solutions.
It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A holographic optical waveguide device for three-dimensional dynamic display, comprising: the optical-mechanical system, the lens system, the coupling-in multiplexing volume holographic grating, the waveguide plate and the coupling-out multiplexing volume holographic grating;
the optical-mechanical system comprises a laser illumination system and a micro-display, wherein the micro-display is used for loading a three-dimensional calculation hologram obtained by performing wave-front coding on a three-dimensional scene, the light wave irradiated to the micro-display by the laser illumination system is modulated according to the three-dimensional calculation hologram, and the modulated light wave carrying three-dimensional scene wave-front information distribution enters the lens system;
the lens system is used for filtering the light wave which is modulated by the three-dimensional calculation hologram loaded by the micro display and carries three-dimensional scene wave front information distribution and then injecting the light wave into the coupling-in multiplexing volume holographic grating;
the coupling multiplexing volume holographic grating is used for coupling the light waves carrying the three-dimensional scene wave-front information distribution into the waveguide plate;
the waveguide plate is used for transmitting the light waves carrying three-dimensional scene wave-front information distribution to the coupled-out multiplex volume holographic grating in a total reflection mode;
and the coupling-out multiplexing volume holographic grating is used for coupling out the light waves carrying the three-dimensional scene wave-front information distribution to human eyes.
2. The holographic optical waveguide device of claim 1, in which the periods of the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating are the same and mirror symmetric.
3. The holographic optical waveguide device of claim 1, wherein the laser illumination system comprises: the device comprises a laser, an attenuation plate, a half-wave plate, an optical fiber coupler, a single-mode polarization maintaining optical fiber, an optical fiber collimator, an electric control rotating platform, a focusing lens and a polarization splitting prism;
the laser is used for emitting polarized light;
the attenuation plate and the half-wave plate are sequentially arranged along the propagation direction of the polarized light and are used for processing the polarized light emitted by the laser into linearly polarized light and adjusting the input energy of the laser;
the optical fiber coupler is used for coupling the linearly polarized light into the single-mode polarization-maintaining optical fiber;
the single-mode polarization maintaining optical fiber is fixed on the electric control rotary table through an optical fiber collimator, and the light wave emergent end is positioned on the central extension line of a rotary disc of the electric control rotary table, and the plane where the light wave emergent end is positioned is the focal plane of the focusing lens, so that the angle of emergent light waves is adjusted by adjusting the rotating angle of the electric control rotary table;
the polarization beam splitter prism is used for emitting the emergent light wave into the micro display and emitting the light wave emitted by the micro display into the lens system.
4. The holographic optical waveguide device according to claim 1, wherein the microdisplay loads the three-dimensional computation hologram at a preset time interval, and determines an angle of a light wave entering the microdisplay according to the three-dimensional computation hologram, so that a rotation angle of the electrically controlled rotary table and a time length of stay at the rotation angle are adjusted by a servo control system of the electrically controlled rotary table according to the angle, so that the light wave emitted by the microdisplay carries a three-dimensional scene wave front information distribution, and dynamic display can be realized.
5. The holographic optical waveguide device of claim 1, wherein the lens system comprises: a first lens, a diaphragm and a second lens;
the first lens is used for imaging the light wave which is transmitted by the micro display and carries three-dimensional scene wave front information distribution on a first plane;
the diaphragm is arranged on the back focal plane of the first lens, deviates from the imaging center and is used for filtering out light waves of other diffraction orders except the first-order diffraction light waves;
and the second lens is used for converging the filtered light waves and then enabling the converged light waves to enter the coupling-in multiplexing volume holographic grating.
6. The holographic optical waveguide device of claim 5, wherein the distance of the second lens from the first plane satisfies the following condition:
Figure 953636DEST_PATH_IMAGE001
wherein,
Figure 733373DEST_PATH_IMAGE002
representing the distance of said second lens from said first plane,
Figure 128582DEST_PATH_IMAGE003
representing the focal length of the second lens.
7. The holographic optical waveguide device of claim 1, in which the in-coupling and out-coupling multiplexed volume holographic gratings comprise angle multiplexed volume holographic gratings.
8. The holographic optical waveguide device according to claim 7, wherein the angle-multiplexed volume holographic grating keeps positions of the object light and the reference light fixed when recording the interference fringes, obtains different angle channels by rotating the recording material, and multiplexes the recording interference fringes at each angle channel, wherein the initial position of the recording material is such that an optical axis of the volume holographic grating is located on a bisector of an angle of the object light and the reference light.
9. The holographic optical waveguide device of claim 8, wherein a rotation angle of the recording material satisfies the following condition:
Figure 880638DEST_PATH_IMAGE004
wherein,
Figure 703100DEST_PATH_IMAGE005
indicates the angle of rotation of the recording material,
Figure 970133DEST_PATH_IMAGE006
indicating the total number of rasters that need to be multiplexed,
Figure 854519DEST_PATH_IMAGE007
representing a minimum multiplexing angular separation;
the minimum multiplexing angular spacing satisfies the following condition:
Figure 523398DEST_PATH_IMAGE008
Figure 516762DEST_PATH_IMAGE007
the minimum multiplexing angular separation is indicated,
Figure 208774DEST_PATH_IMAGE009
representing the Bragg angle, L being the thickness of the recording materialAnd the degree, lambda is the wavelength of the recording light, and theta is the included angle between the object light and the reference light and the optical axis during recording.
10. An augmented reality display device, comprising:
a three-dimensional dynamically displayed holographic optical waveguide device according to any of claims 1 to 9.
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